If you can find and watch the video, the people in the back were covering their faces like ANTIFA to the front where people were looking like MAGA. They weren't, they were ANTIFA, other activists, and angry people who just happened to be there.
Sullivan is from Houston, where he was arrested at a BLM rally for shooting at cars. There is a photo of him with Ray Epps in Washington DC before Jan 6.
Now if that raises questions, ask yourself why CNN had Sullivan on air as if he was some innocent bystander caught up in all of this and treated him as a hero.
I am pretty sure Sullivan was from Provo, Utah not Houston, he was involved in a violent protest in Utah.